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What is the concentration of the chromium (III) ion in a concentrated aqueous solution of $Cr(OH)_{3}$?

$K_{sp}$ for $CrOH_{3}$ is $1.2 \times 10^{-15}$.

A

$1.4 \times 10^{-4} $

B

$8.2 \times 10^{-5}$

C

$3.5 \times 10^{-6}$

D

$6.7 \times 10^{-6}$

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